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//===- DWARFDebugAddr.h -------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===------------------------------------------------------------------===//
#ifndef LLVM_DEBUGINFO_DWARF_DWARFDEBUGADDR_H
#define LLVM_DEBUGINFO_DWARF_DWARFDEBUGADDR_H
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/Support/Error.h"
#include <cstdint>
#include <vector>
namespace llvm {
class raw_ostream;
class DWARFDataExtractor;
/// A class representing an address table as specified in DWARF v5.
/// The table consists of a header followed by an array of address values from
/// .debug_addr section.
class DWARFDebugAddrTable {
dwarf::DwarfFormat Format;
uint64_t Offset;
/// The total length of the entries for this table, not including the length
/// field itself.
uint64_t Length = 0;
/// The DWARF version number.
uint16_t Version;
/// The size in bytes of an address on the target architecture. For
/// segmented addressing, this is the size of the offset portion of the
/// address.
uint8_t AddrSize;
/// The size in bytes of a segment selector on the target architecture.
/// If the target system uses a flat address space, this value is 0.
uint8_t SegSize;
std::vector<uint64_t> Addrs;
/// Invalidate Length field to stop further processing.
void invalidateLength() { Length = 0; }
Error extractAddresses(const DWARFDataExtractor &Data, uint64_t *OffsetPtr,
uint64_t EndOffset);
public:
/// Extract the entire table, including all addresses.
Error extract(const DWARFDataExtractor &Data, uint64_t *OffsetPtr,
uint16_t CUVersion, uint8_t CUAddrSize,
std::function<void(Error)> WarnCallback);
/// Extract a DWARFv5 address table.
Error extractV5(const DWARFDataExtractor &Data, uint64_t *OffsetPtr,
uint8_t CUAddrSize, std::function<void(Error)> WarnCallback);
/// Extract a pre-DWARFv5 address table. Such tables do not have a header
/// and consist only of a series of addresses.
/// See https://gcc.gnu.org/wiki/DebugFission for details.
Error extractPreStandard(const DWARFDataExtractor &Data, uint64_t *OffsetPtr,
uint16_t CUVersion, uint8_t CUAddrSize);
void dump(raw_ostream &OS, DIDumpOptions DumpOpts = {}) const;
/// Return the address based on a given index.
Expected<uint64_t> getAddrEntry(uint32_t Index) const;
/// Return the full length of this table, including the length field.
/// Return std::nullopt if the length cannot be identified reliably.
std::optional<uint64_t> getFullLength() const;
/// Return the DWARF format of this table.
dwarf::DwarfFormat getFormat() const { return Format; }
/// Return the length of this table.
uint64_t getLength() const { return Length; }
/// Return the version of this table.
uint16_t getVersion() const { return Version; }
/// Return the address size of this table.
uint8_t getAddressSize() const { return AddrSize; }
/// Return the segment selector size of this table.
uint8_t getSegmentSelectorSize() const { return SegSize; }
/// Return the parsed addresses of this table.
ArrayRef<uint64_t> getAddressEntries() const { return Addrs; }
};
} // end namespace llvm
#endif // LLVM_DEBUGINFO_DWARF_DWARFDEBUGADDR_H
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